product listing in back-office with tax

Yes. You can edit the file listing of the view product of the back end for your backend template via the menu Display->Views and then change the code:
echo $this->currencyHelper->displayPrices(@$row->prices);
to:
echo $this->currencyHelper->displayPrices(@$row->prices,'price_value_with_tax');

Try like that then:

if(!empty($row->prices)){
foreach($row->prices as $k => $p){
$row->prices[$k]->price_value_with_tax = $this->currencyHelper->getTaxedPrice($p->price_value,hikashop_getZone(),$row->product_tax_id,2);
}
}
echo $this->currencyHelper->displayPrices(@$row->prices,'price_value_with_tax');

The price column is not sortable. The problem is that a product can have several prices which are stored in the different table in the database. So it's way more complicated to sort the listing by the price and it will give out strange results in some cases.
For the alignment, you can just change the <td> to <td align="right"> before that line of code.